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A gas main had cracked under my neighbour's garage and gas had seeped into our homes.

邻居车库下面的煤气总管裂开了，煤气渗入了我们家。

柯林斯例句

I turn off gas main.

是(我关掉煤气的总开关)之意.

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If you can't do it by yourself, you should call somebody to check the gas main.

如果你自己做不了, 就应该叫别人来检查煤气总管道.

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